Two-stroke and double-acting motor



M. LEBLANC. TWO STROKE AND DOUBLE ACTING MOTOR. APPLICATION FILED NOV. 18, 1918- v 1, 354, 1 a Patented 5, 1920.

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*1 I rr- 29 5 I 7 30 /E UNITED STATES PATENT OFFICE.

MAURICE LEBLANC, VAL-SUR-SEINE, PAR GROISSY, FRANCE, ASS-IGNOR TO STE. ANONYME POUR LEXPLOITATION DES PROCEDES WESTINGHOUSE LEBLAN'C, 0F

PARIS, FRANCE.

. TWO-STROKE AND DOUBLE-ACTING MOTOR.

: Specification of Letters Patent. Patented O t 5 1920 Application fil ed November 1'8, 1918. Serial No. 263,111.

To all whmnc't may concern 7 fBe it known that I, liInUnIon'LnBLANo, a citizen subjectiof the Republic of France, residing in Val-sur-Seine, par. Croissy, Seine-t-Oise, France, have made a new and useful'lnvention in Two-Stroke and Double- Aeting Hotors, of which the following is a specification. I v

This invention relates to internal combustion motors of the two-stroke double acting type. i

@ne of the difficulties experienced in the construction of two-stroke motors is to secure dynamic balancing of the moving masses at the same time as a regular distribution of the explosions during a revolution of the motor.

The present invention has for its object to provide an improved construction of motor which enables this double condition to be fulfilled.

The following description, taken in connection with the acompanying drawing, representing by way of example in a vertical longitudinal section one form of construction in accordance with this invention, will enable its characteristics and advantages to be readily understood.

' A piston 1 prolonged above and below by sleeves 2, 3 is connected by a connecting rod 1 to the crank 5 of a crankshaft 8 and moves in cylinder 9. The particular'feature of this cylinder is that it is not fixed but is itself connected by two connecting rods 10, 11 to two other cranks 6, 7 of the crankshaft 8, said cranks 6, 7 being diametrically opposite to the crank 5 which controls the movement of the piston.

The respective strokes of the piston 1 and of the cylinder 9 may be different but are preferably equal.

The cylinder 9 is itself guided in a second cylinder 12 whose sole function is to act as a guide. The spark plugs 13, 14, mounted in the wall of the motor cylinder 9 are carried during the movement of this cylinder and move in chambers 15, 16 formed for this purpose in the wall of the cylinder 12, their extremities carrying a brush 17 18 rubbing on the cover 19, 20 formed of insulating material, of the chambers 15, 16. Said brushes make contact with conducting plates 21, 22 situated in the insulating mass at the moment when the secondary current produced in the magneto by the rupture of the primary current flows through the conductors 28, 2 1. The spark will then take place at the spark plug, the brush of which is in contact with its cooperating plate. The spark plugs and their plates in this way replace the distributer of the magneto.

The operation of the motor described above is as follows, commencing from the position shown in the drawing.

The carbureted mixture continuously fed into the upper part of the cylinder 12, and which fills the sleeve 2, the interior of the piston 1, and the sleeve 3 which it cools, passes through the ports 26 of the sleeve 3 into the motor cylinder 9, driving in front of it the residue of burnt gases of the previous explosion which escape through the ports 27 of the motor cylinder into the escape pipe 28. At the same instant the spark will occur at the spark plug 13 and bring about in the upper annular chamber combustion of the mixture therein inclosed and compressed during the preceding stroke. This explosion drives the piston 1 downward and the motor cylinder 9 upward, thus causing by the action of the connecting rods 4;, 10 and 11 a driving torque to be impressed on the crankshaft.

It is to be noted that the bearings 29, 30 of the crankshaft do not subject the latter to any reaction apart from the lateral forces due to the obliquity of the crankshafts, which forces are always small compared with the other forces which come into play.

The piston 1 descending and the cylinder 9 ascending the lower annular space diminishes and the compression of the fresh mixture which has been admitted below the lower face of the piston is thus brought about. Toward the end of the stroke fresh mixture is admitted by the ports 25 of the sleeve 2 into the upper annular space, driv It will be seen that such motor, although monocylindrical, may be dynamically balanced similarly to a four cylinder four- Q'stroke motor. of 'theusual type,-a nd have like the latter two explosions per revolution equally spaced.

Each motor element constructed in this- Jw'ay being properly balanced and having two explosions at 180 apart, it will be read-i ily understoodthat a motor may be con structed of any number of'slmilar motor elements, it being onlynecessaryto displace suitably the angle of the crank pins of the different motor elements to provide a motor the'movlng parts of which are balanced dynamically and in whichthe explosions are equally distributed 1na revolut on.

I claim as my invention a 1. In a two cycle lnternal combust on ena movably mounted ported cylinder surrounding said piston and with it forming a double acting engine,;ro ds connecting said piston and-said cylinder with 'tl1e.e1 gine "crank shaft, and means for forcing combustible mixture intothe combustion spaces on opposite sides of said piston through said piston and its trunks.

- 2. In-combination with a structure as set forth in claim 1, ignition devices carried by the movable cylinder; 1

3. In combination with a structure as set forth in claim 2, a housing surrounding the movable cylinder provided with a centrally located exhaust passage, an inlet passage communicating with one end thereof and a rotary compression device discharging into said passage and driven from the engine crankshaft.

In witness whereof, I have hereunto signed my name.

MAURICE LEBLANC. 

